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Doc: clarify NULLS NOT DISTINCT use in unique indexes

David Rowley <drowley@postgresql.org>

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Commit: 94d73f9abdf13e6dd93d96d0e4b197479c8756de
Author: David Rowley <drowley@postgresql.org>
Date: 2023-04-20T11:52:36Z
Releases: 15.3 
Doc: clarify NULLS NOT DISTINCT use in unique indexes

indexes-unique.html mentioned nothing about the availability of NULLS NOT
DISTINCT to modify the NULLs-are-not-equal behavior of unique indexes.
Add this to the synopsis and clarify what it does regarding NULLs.

Author: David Gilman, David Rowley
Reviewed-by: Corey Huinker
Discussion: https://postgr.es/m/CALBH9DDr3NLqzWop1z5uZE-M5G_GYUuAeHFHQeyzFbNd8W0d=Q@mail.gmail.com
Backpatch-through: 15, where NULLS NOT DISTINCT was added

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doc/src/sgml/indices.sgml modified +6 −4

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